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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b45cd46c4962af17827c5c2a993a2a734880d703fc2330a5666ec2abf1e6837f' 
  AND token = 'P5p8vLrACg3EvvdUxpBGLW58cAlpHIahN5rkZb4DEyc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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