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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf495a34f001884579d5cd83cdf04358fd6a28facb94c8e377c0d29f3c83379e' 
  AND token = 'zOpXc/cy1/1p8Gzxh803pw4B9ioe8rsXhdvZP7Rttg4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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