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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b62539c163a0ff7120bd3e2bc115799c11525511d73b3bd93547a097ea1c320a' 
  AND token = '+JZ8mCtzIbQ7OsDYEsbQydn22iz2pScb6nzaM58QLxE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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