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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '22cee92c1bde2cb6b4d9cd4c7e1ebdc877b092281ac23bc0a9529babca3cff31' 
  AND token = 'aEm5ELcA5GTabNEoH3uhfL2y0M7fVQ0Bm1deEYX1Bmc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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