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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b96891162ceeee4e20ef8178fd2c24a2f368a22fc9fbf369ae80b2aed647a592' 
  AND token = 'Lyhq738M1nhXIMm28iGLVBRvXnpNxIKjk3Dl4JlUOEA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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