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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6cb2c1475085fc22ae584cd210978aa8dc1aa1cdd4d910cbb77a097559e1fada' 
  AND token = 'LlJ79cpbwjbCv4ChzmoC8drkaxiPE4HPHXNM2gPMl2Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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