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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b38061fe419b09fefa7736adc54671510af5970fff0e822f63896e687c7a0e63' 
  AND token = 'dinMooH0NIW7QjXTCTGS4Jl+nnihY7/Y2LR1bUIz4+8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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