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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '107b89590fcf5499ddcbaf0d3066f89c72e388a6eaac66ad228e50c6620cda8c' 
  AND token = 'eaU+N0VdL3WuJD38DdyroPx9ledCe3AJzhE7UKiIPMI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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