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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29bca8a6e9b2061fa971d5d453729c708d0125c15676ca548ae30230451e9ae9' 
  AND token = 'SIH0y2YwTnKaUjecsA30nOP7mDaZO/26pBh8ZEo3IGE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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