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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e197fa7dc7ff543a8a872ca2fa3f82b7b630f63094f648595dc67f36cdbfbac' 
  AND token = '8nZzXB7a2klR0K4y6NEZ8ChitOyqdx7GjAqCCaV0vDA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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