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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3ba40125c2c671bd9004a45aceaff09fe8974291b7d196a2e3a0ed8c2f2f953' 
  AND token = 'X+CX4iJj2CWJ44OH5OuZ/EH/9EIRVoX2xGABCDSWz0w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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