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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32b611a0bda7be4bc07e02212fdc1e7bbfca9b3c0bec44f379ee3b0decc5843a' 
  AND token = 'EY/JWMmlMNlDyVr1nnYUU4j/9AGn9hFo+/bGZUbcsgg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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