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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '358823ad6536ee8b9032f234cfaaf901552d7d2ef0ffe41ce9ed532689f092be' 
  AND token = 'C7MndFtZgwBG4vMIm5Jcva13XTTuiN2nMc4C7Pm+oe0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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