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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '007eea0d2e57b510f52f02064fdead7cc75a24675e979351669dc564d5642a6b' 
  AND token = 'Z/wbN4iuvptryIFcohncnO8INRKPCPjTpv7+Ow2nXRk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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