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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0317df0656dbe1f927876d4d5f77f2f22ef9c53b3570b215d355693aa2bcfc5' 
  AND token = 'IWa9ixm+tr5AxswMR5aLyGQIBiIvR32EPKZMN7MeyGg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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