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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e31c34713cd2e57856ff9293ff3ad94d0e371e4cebf72deceb288a09f4bed2f0' 
  AND token = '2up6othJ3jhBM53PQ3ERV+O+ZcH2EWhad67AzsFmQik=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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