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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1050daac3334279b617ace91bfbdb810cbda9598a6b85cac9e3f9b03dbb3a54' 
  AND token = '5eA20QBCvCmG7h4bFqupOHIo+Atb3u1okjXUcnyLRBE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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