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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34c7313c8450f54e9e8baaef3d9027ef3f4c7485fc11cfe67f5344458f5dd5b9' 
  AND token = 'Fhsn6j/iTwkFPgyuEm1Bd9nfhpM32ur38fvKVsizNhE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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