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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec37fbc5287d223c0953e2e4b32ac37eb2e3327fbc8671031b52816e03c55fec' 
  AND token = 'R8lMA+4G68/G36WNcfnunn/k96zYUWKPsAWN3pXI1tY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}