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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abe39f9a3e43344d1186b6bdf16d1b807ebed49e4cd32e65198765d1c28a40fa' 
  AND token = 'aYJd7d7KPy+ODPIywJdxDMy/KMZ7+v1X+/0orT1LzxE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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