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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1eda2087fdab21fe54686a307685e525b530bfc3de1aa1512e0ae51eb2ad1192' 
  AND token = 'oW7BpD74QbaOpfQ8uErBxdtyksXElAwGfF1e6gHIyTc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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