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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe1c96cb0151c7baabd92d929736a1400187255ef262a7e014252e6f5c5c7d87' 
  AND token = 'nPVFo83pQImwhAV0GUpdnPVp+TSyne4x9opr7nW62Jw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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