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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ee84e2a0912e8491f998fbe1a7d61bf4a9673b93312ce42a88cf23c2e9116c1' 
  AND token = '/v1cviiyx7DH525YQ3H3a9epGAzECma3GGgPyZTEZ0I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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