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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c18e341c1d3412562a47124c99032eb8dc173857e57f0ac68513d3f97ec73a5' 
  AND token = 'I5T9moGQb87HbCGYvsALrcbFO6/l6Ji219OoChlS+Ig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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