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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1e1090b91db6eacc4e62ddddf5f2afdf6ead639c18bcd9b08f4b33b1a1ae0f3' 
  AND token = '3AQ72h6uf+MYCsihANi79HnPuvvQLXSzzH56CBlmOfs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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