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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '936ad899b0478b9f5e97948af25c27024de08e0ab84529a5370672879ccf9a7a' 
  AND token = 'q2yfpbAs4SbB/tzJxj2sUhiVVooTJP4sCT6QI6FjNE0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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