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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb8075642f6ec0d2e30220ffaa9cc8a74a14187bde46d53956e96c9e2bb89f2a' 
  AND token = 'whjjENJMMFRuMxXkN9dk/Lr1kNyeSjcmebwpqFkI9dQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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