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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '675e4155c3825c7378dc1120baf6e2effbff69f4d58c5fe112f99b1d7f66e40a' 
  AND token = 'MJFO7bO/0eCwlN0AOLtTOwhLb+NBknkEQGLa4BY07ag=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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