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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'caba46200d8868850174f60e6883ae52f78a3791e3f6169cca6046897d1e2685' 
  AND token = '4dSi3X2mvKSBEO//lsR8yC62DVuPH6DCU8NId0ov0a0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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