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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c51bfabfd06d32eb37426c162eeed20b348d2be4a71b47d5438a96671480d36b' 
  AND token = 'B4gPEoJHQMAbrXkXkvp2v8JHNLmD+THZpAD/a2B4RhA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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