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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '49249328a3dd119dea3588d465514e71f6e931c522a32acf0256a3fff2e3dd0c' 
  AND token = 'aFshGRsamELmGl2oXmsEOHxFH2spkxc28ylM7MLhDRE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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