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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0d94e0547ecd2cf3ee6287d7110132fc51625af54e38eaf02fef7d0c1ff485f' 
  AND token = 'fzuKYVOXOc5xLrLV1FNTgrJ/G36Lco5PaIKgR2ex+l0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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