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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2345f5b1802442aa3bbe4e9d6b861814aba690d127aa5cdb3d3acfc0cc28b173' 
  AND token = 'QouqygBCAPeJ+BWAGFuuyOW5jrdJbYwg7dfKauM0LkU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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