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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd18c5f4123179630e12b04a48fcfb62f458bec617110583b06a942c83ae95071' 
  AND token = 'TAyLYR3pBoo/b9zpPIgLC0U8PE1AUVcZTyJLxaeR1so=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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