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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '575dcd89bb77b48aaa312a64d8b33e7aad5dea962ab8f8516ea7574876b96c76' 
  AND token = 'LOXB87kCgpK7N0b+JoV/atXBTV2l3aWMPMuibFCyBoM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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