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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7421305f6b6d5423a425ba7cdaa90f2065986a296b308f2e33cc94328029e31c' 
  AND token = 'dV5LHkBwuNYq7Xs43REhrzw9HbHO4NYAIyekCGQAu3c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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