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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cdce764e89b789fe0f98de1175871fda4d448e42fa9466762dc69cf24a0702a8' 
  AND token = '26tJpEI487GkqzMRRWD1yoczwGYZ3y4QM4Csbv44lEU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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