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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1106a0524ba88636c4d9a7232c435bd419a496c1fff36e47261d34c22d0821ea' 
  AND token = 'aV/l8gPI/k7eKizXsLj23+Fk1ucd+nzDSreNsN7oGWQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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