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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94b1da3d631d1e5e7e54a39c6701c7a624cc4f4d7287c7457b2e3f66d179bea2' 
  AND token = 'V0rS84p+ruEqOFlk1757dXgVvh8D5mZPFtrA5hRZ/TU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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