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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '700c7b36ad45f2badd665cddfac50654768705fd007571e0c40a8130aeeb235e' 
  AND token = 'PvcvhIuxx/m9j/LD1ty1DWSzzCJFQ/uIkVJok8egCEo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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